Intergeared offset disk harrow



Dec. 3, 1940. f J. v. DYRR INTERGEARED OFFSET DISK HARROW Original FiledNov. 2G, 1934; 3 Sheets-Sheet 1 @OOOQQ r.. my mm rd, /W m Dec. 3, 1940.J. v. DYRR INTERGEARED OFFSET DISK HARROW Original Filed Nov. 20, 1934 3Sheets-Sheet 2 Dec. 3, 1940. J. v. DYRR Re. 21,643

INTERGEARED lOFFSET DISK HARROW Original Filed Nov'. 2.0, 1934 3Sheets-Sheet 3 Ressued Dec. 3, 1940 UNITED STATES PATENT OFFICEINTERGEABED OFFSET DISK HABRQW poration of New Jersey Original No.2,164,204, dated June 27, 1939, Serial No. 753,877, November 20, 1934.Application for reissue June 27, 1940, Serial No. 342,829

28 Claims.

This invention `has to do with the type of ground working implement thatis shown in my issued Patents 1,916,720 and 1,916,721, dated July 4,1933; and the general object of the invention is to provide, for thatgeneral type of device, an improved arrangement and means for angling,and controlling the angling of, the plurality of gangs which arecharacteristic of this type of device.

In, for instance, my prior Patent 1,916,721 I have shown a harrowcomprising two gangs of disks, intercoupied to swing or angle relativeto each other, and so coupled to draft means that the draft, incooperation with the soil drag, tends to angle the gangs. In thearrangement there shown, the draft means is coupled to the forward gangat one side, and to the rear gangat the other side; and the two gangsare intergeared so that angling of one gang tends also to angle theother. For positively angling the gangs into certain positions, forinstance, for a right-hand turn, and for controlling the anglings inthat and certain other positions, I have provided a control line which,being attached to the tractor at an offset point at one side, isconnected to the rear gang at the opposite side, and at the side of thatrear gang opposite to that at which the draft is coupled to the reargang.

In my present arrangement I couple such a control line to the forwardgang rather than to the rear gang, and at the same side of the forwardgang as that at which the draft is coupled to the rear gang. -And also,in coupling such control line to the forward gang I provide a meanswhereby, under the control and operation of this control line, the reargangs draft connection may be locked in various positions relative tothe front gang; and thus I provide in a simple and effective arrangementnot only an angling and angling control line going directly to the frontgang, but also a gang locking means actuated automatically by suchcontrol line.

The invention will be better understood from a consideration of anillustrative and preferred form of embodiment set out in the followingdescription and in the accompanying drawings in which:

Figure l is a plan showing a typical two-gang disk harrow equipped withmy present improvements;

Figures 2, 3 and 4 are sectional details on lines 2-2, L-l and 4-4,respectively of Figures l, 2 and 1;

Figures 5, 6 and 7 are diagrams illustrating typical positions assumedby the harrow in operation;

Figures 8, 9 and 10 are enlarged details showing positions of thecontrol and locking vdevices corresponding respectively to the positionsof Figures 5, 6 and '7.

Referring first in a general way to Figure 1, I show there a two-gangdisk harrow of the same general type as shown in'my Patent 1,916,721,including a, forward gang of disks with a. gang frame I and a rear gangof disks with a gang frame Ii. These two gangs are interconnected sothat they may swing relative to each other, and preferably, as in myformer patents, I intergear the two gangs by means of meshing gearsegments I2 and I3 which are mounted respectively on the two-gangframes, and by a radius bar I4 pivoted to the two frames at I5 and- I6at the centers of the two-gear segments. Gear confining plates I1 andI0, above and below the gears, are mounted on and carried by the radiusbar I4; and a locking mechanism, generally designated by the numeral andoperated by handle 2| and pull cord 22, is mounted upon the upper plateI1 to lock into notches such as 23 provided in the bracket 24 thatcarries the rear gear segment on the rear gang frame il. The details ofthis locking mechanism need not here be explained as they are explainedfully in my Patent 1,916,721, to whichreference is hereby made.

Such a locking device may be used for locking, and for limiting therelative anglings of the gang, in connection with the locking controldevices which are hereinafter explained, or those hereinafter explainedmay be used solely and without the control and locking device 20. Also,for limiting the anglings of the gangs in certain positions I mayfurther use another arrangement shown in by said prior patent. It willbe understood plates i1 and IB, being carried by radius bar I4, moverelative to the gear segments and to the brackets 24 and 25 which carrythem. The plates may thus be' provided with holes 28 into which a pin 21may be dropped; and that pin. in such angling positions as shown inFigure 5, will come into contact with bracket portion 25a and thusoperate as another limit to gang angling.

In Figures 2 and 3 I show my present preferred form of bearing andbearing mounting for the disk shafts. The disk shaft as shown is square,the disks 3| fitting the square shaft. Fitted upon the square shaft is abearing sleeve 32. having a stepped cylindric exterior bearing surfacewhich nts in the bearing block 3l. A flange 34 at the larger end of thebearing sleeve bears against a disk 8|. Another flange Il, fitted on thesmaller end of the bearing sleeve fits the shaft and bears endwiseagainst the next disk Il. End thrust is taken at the step shoulder 32a of the bearing sleeve. 'Ihe bearing sleeve '32, with its flange Il andflange disk Il is thus a spacer between two adjacent disks. Die bearingsleeve I! is cored out, and tits the shaft only at its flanged end Il.At its smaller end it fits into flange plate 3B, which nts the shaft.

Bearing block Il is pivotally supported by horisontai tnmnions in a yokeIl, and the yoke has a vertical pin 3l that has bearing in a bearingbracket 3l secured to the gang frame. By such a bearing structure thedisk shafts are mounted in universally movable bearings. which preventsall binding which might otherwise be due to either inaccuracies ofworkmanship or bending or warping of the frame and other parts. Thestructure lends itself very readily to con` struction not requiringgreat accuracy. and is very much conducive to long life and low frictionof the bearings.

Between other adjacent disks Il, spacer sleeves III are fitted on theshaft; vand the whole shaftdisk assembly is held toether by beingendwise confined. as by nut 82| and-washer 322 at the shaft end. Buchnut and washer may be used at both shaft ends, or at one end of theshaft the confining shoulder may be a permanent head.

In such harrows as I am here describing, the arrangement is usually suchthat the barrow trails the tractor in an oii'set position, the disks ofthe front gang usually being concave toward the right and those of therear gang concave toward the left. For the WI'POSes of simplicity inthis description I shall therefore describe the draft and anglingcontrol devices as they are in practice applied to the gangs at rightand left, respectively, Ibut without necessary limitation of theinvention to those relative transverse directions. I may also note thatthe intergearing of the two gangs is preferably somewhat to the left ofthe center of the gangs. and that the gear section I2 of the rear gangpreferably is of smaller radius than gear Il of the forward gang. so asto cause the angling movement of the rear gang to angle the forwardgang, rather than vice versa. I will thus proceed to describe the draftand angling devices. using the terms right" and 1eft" as they appear toan observer standing behind the harrow and facing forward toward thetractor.

The draft is coupled to the forward gang at the right-hand front corner,through a universally flexible clevis Il. 'I'he draft frame is made upof a primary draft bar Il, adjustable in length; a secondary draft bar42 also adjustable in length; and a spreader bar Il. VBars Il and Il arepivoted together at M to the draft clevis Il, bar Il is pivotallyconnected at Il to the forward end portion of bar ll; and the two barsI2 and u are connected together at the pivot 4l where coupling is madeto the universal clevis ll to which the rear gang draft bar 4l isconnected. This draft bar Il connects pivotally, that is exibiy, at Ilwith the left-hand side of the rear gang frame.

Draft bar 4I passes through a slot Il in a vertical plate II mounted onthe front of the forward gang frame il, Bar 4l may preferably berectangular in cross section. and the slot il is ofsuchsixeastofreelypasstherodandtoallow for its transverse change ofposition relative to the front frame. Plate il, in addition to being aguide for bar 4l, performs the cnice of a stop which limits the rearwardmovement of bar 4I in positions similar to that shown in Figures 6 and9. In a position just beyond that shown in these figures the clevis 41will move back against plate Il and thus may act to limit anglingpositions such as are shown in Figure 6.

Slidable on bar 4l behind plate 6| is a lock block I3. This block ispreferably tubular in form. large enough that it cannot pass through theplate slot Il, and it carries a locking pin 54 adapted to enter any oneof a number of longitudinally spaced holes il in bar Il. This pin $4 iscarried by arm II of a small bell crank lever pivod on the lock block,the other arm I'I of the lever having a spring Il and a pull cord l!connected to it. Pull cord I! extends forward to the tractor to bewithin easy reach of the operator. Tension spring il is connected at itsother end tc the block Il. so that the spring always tends to move lockpin Il into any hole il which comes into register.

Extending forwardly from lock block Il, and normally projectingforwardly through stop plate Il is a latch tongue il having on itsforward end a projecting latch lug Il. In the normal position of thelock block and the latch, the lug Il is engaged from behind by a latchpawi Il pivoted at Il on the left-hand side lor end of frame I I. 'Ihispawl is normally moved into position to engage behind the latch lug by aspring Il: and, as will readily be seen from Figure 8. for instance. thelatch paw] engages behind lug 0i when block il is in its forwardposition against plate Il. Thus. in such a position of the parts, if theblock 53 is then locked by pin M to bar Il. the bar I8 is held immovablerelative to the front gang and consequently the ltwo gangs arerelatively locked against changes of angle. Retraction of pin 54bypullingonline willatanytlmereleasebar ll from the lock block and allowthe gangs to change angle.

Latch pawl i2 has an eye to which the rear end of the angling andcontrol member It is attached. This member, here shown as a chain, hasits forward end attached to a member I1 of the draft bracket which ismounted on the tractor T. This draft bracket may be made up in anysuitable manner to provide for coupling member Il at a laterally offsetpoint. As shown in the drawings, the draft bracket may be made up of adraft member or draw-.bar Il. to which the draft bar Il is pivotally,flexibly. attached at 69, preferably on the center line of the tractor.And the draft bracket may include the bracket member Il which extendsout to the left and has in it a plurality of spaced holes 'Il to whichthe forward end of chain I8 may be selectively connected. as by ans-hook 1I which may be hooked into any hole and hooked into any chainlink. The length of member Il thus may be made adjustable, as also thelateral offset of its coupling to the tractor.

The leg Il, the pawl 62, and the spring M constitute release means actdirectly on the front gang Il.

'Ihe rear gang draft bar Il, the block 5I, and the latch pawl l!constitute means for holding the barrow gangs against relative anglingmovement. The pawl t! mounted at Il on the frame Il may be considered arelease means mounted on the forward harrow'gang for releasing the gangsso that they are permitted relative angling movement.

Figure 1 shows the implement in the position used when being transportedwithout doing any work. In this position the gangs are substantiallyparallel and the planes of the disks are substantially directly fore andaft, so that they will not dig into the surface on which they roll. Thegangs are locked in this position by the lock block and latch. as willbe readily understood from Figure l. In this position. with the tractorpulling substantially straight ahead, control chain Il is slack as isindicated in Figure l.

When it is desired to put the implement to work, lock block Il isreleased by pulling on cord I8, and the two gangs then automaticallytake such a working position as shown in Figure 7. In

taking this position the left-hand end of forward y gang I movesrelatively rearwardly, and carries the block il rearwardly along draftbar 4l. When the parts have reached such a working positionasshowninFigures'I and l0,theslackinchain has not been sufilcientlytaken up to pull latch pawl 62 out of engagement with lug il; the

lock block still remains locked to the front frame although bar 4l hasbeen released. In this working position the control chain may be nearlytaut, but the pawl l2 still holds lug Il, and consequently block 53 isstill held up against stop plate 5I. Consequently, after the gangs havereached their working angle, release of cord I8 will allow pin Il toenter a hole i8 ln draft bar 48 and thus lock the gangs in their angledworking positions.

When the tractor makes a turn to the right. chain i8 is pulled taut, andlatch pawl l2 is immediately pulled out to the relative position shownin Figures 6 and 9. This releasesl the left end of the forward gang fromdraft bar 4l. and further forward pulling on chain IG as the tractorturns to the right pulls the left end of the front gang forwardly untilthe parts have reached such a relative position as shown in Figures 6and 9. For this operation the lock block Il need not be released fromdraft rod 4l and it may therefore travel relatively rearwardly with therod Il in` such a position as shown in Figure 9. With the gangs in therelative positions shown in Figure 6, no lock is needed as long as thetractor continues to turn to the right; as, in this position, the gangangles-are held by the combined actions of the draft means and thecontrol chain l..

In the position for right-hand turn explained in the last paragraph. therear gang has moved upl relatively forwardly. on the forward gang. Inthe normal working position of Figure 5 the rear gang is angled back,and the locking arrangements hold it in that relative angled position,angularly spaced from the front gang. When pawl 62 is withdrawn by thepull on chain II, releasing lock block 53, the rear gang is then nolonger held in angular spacing from the front gang, but can and doesmove forward and close up on the front gang.

If from the right-hand turn position it is desired to go again intoworking lposition of Figures '7 and 10, the block 5I which has not .beendisturbed in its position on rod 4l will automatically move forwardly toits position of Figure l0, and chain il then being slack. pawl C! willautomatically reengage the latch lug I l. If, on the other hand, blockIl has been released from rod Il for any reason, a forward pull on cordD! will always hold the locking pin 5I up and slide the block S3forwardly along the rod until it reaches the position of Figure l0 wherepawl I2 can engage thelug. Release of cord I! then engages the lockingpin I4. to lock the parts in position.

On making a left-hand turn the rear gang Il tends to drag behind andthus tends to increase its angle and also to increase the opposite angleof front gang I0. The result of these actions is relatively to move theleft-hand end of the rear gang forwardly, and the left-hand end of theforward gang rearwardly, so the parts tend to take such a position asshown in Figures 5 and 8. The selected point of tractor attachment ofchain 6B is such that the left-hand turning of the tractorl will keepchain .I slack, or increase its slack, as the left-hand end of theforward gang drops relatively rearwardly.

The left-hand turn can be, and usually is, made in the `working positionof Figures '7 and 10. If, however. it is desired to increase the angles.either for working or left-handvturning. it is only necessary to pull oncord il.

tively forwardly through lock block 53; but the lock block is still heldin position by pawl 82 engaginglug Il. When the gangs have reached asuitable left-hand turning position lock pin Il may be released to againlock the block Il to rod Il; and the Bangs may thus be locked in alefthand turning position in which they will also effectively cultivatethe soil.

I claim:

l. A tractor-operated ground-working implement comprising forward andrearward gangs of ground-working tools, means interconnecting the gangsfor relative angling movement in a horizontal plane, draft meansflexibly connected to the tractor and to both gangs, being connected tothe forward gang at one side of the gang interconnection and to therearward gang at the other side of the interconnection, and an anglingcontrol member connected to the tractor at a point voifl'set laterallyfrom the point of draft connection thereto and directly to the forwardgang at a point oil'set laterally to the la'st mentioned side of thegang interconnection. y

2. A tractor-operated ground-working implement comprising forward andrearward gangs of ground-working tools, means interconnecting the gangsfor relative angling movement in a horizontal plane, draft meansflexibly connected to the tractor and embodying draft members severallyflexibly connected to the forward gang at one side of the ganginterconnection and to the rear gang at the other side of theinterconnection, the reargang-connected member being movable relative tothe forward gang, an angling control member connected to the tractor ata point offset laterally from the point of draft connection thereto andto the forward gang at a point offset laterally to the last mentionedside of the gang interconnection, and stop means acting between the reargang draft member and the forward gang and controlled by the controlmember.

3. A tractor-operated ground-working implement comprising forward andrearward gangs of ground-working tools, means interconnecting the gangsfor relative angling movement in a horizontal plane. draft meansilexibly connected to the tractor and embodying draft Imembers severallyflexibly connected to the forward gang at one side of the ganginterconnection and to the rear gang at the other side of theinterconnection, the rear-gang-connected member being movable relativeto the forward gang, an angling to the tractor and to the forward gangat one side of the gang interconnection and to the rearward gang at theother side of the interconnection. the draft member connected to therearward gang being movable relative to the forward gana. a controlmember connected to the tractor at a point laterally onset from thepoint of draft connection thereto and connected to the forward gang atthe last mentioned side of the gang interconnection, and stop meansacting betweenthereargangdraftmemberandthe forward gang controllable bythe control member.

5. A tractor-operated ground-working implement comprising forward andrearward gangs of groimd-working tools, means interconnecting the gangsfor relative angling movement in a horisontal plane. draft membersflexibly connected to the tractor and to the. forward gang at one sideof the gang interconnection and to the rearward gang at the other sideof the interconnection. the draft member connected to the rearward gangbeing movable relative to the forward gang. a control member connectedto the tractor ata point laterally offset from the pointofdraftconnectiontheretoandconnectedtotheforwardgangatthelastmentlonedsidecftheganginterconnection, the draft memberconnected to the rearward gang including a draft bar. a lock blockslidable on. the bar, manually controlled meansforlockingtheblocktothebar, andmeans 4l for locking the block to the forward gang andcontrolled by the control member. A 8. A tractor-operated ground-workingimple ment comprising forward and rearward gangs of groimd-workingtoolsl means interconnecting the 5 gangs for relative angling movementin a horisontal plane. draft members flexibly connected to the tractorand to tbe forward gang at one side of the gang interconnection and tothe rearward gang at the other side of the interconnection. the

55 draft member connected to the rearward gang including a draft barmovable relative to the forward gang. a latch pawl movably connectedwith the forward gang at the last mentioned side of the ganginterconnection, a lock block slidableaonsaiddraftbanmanuailycontrolledmeinsto lock the block to said bar.means engageable by the pawl to hold the block against movement relativeto the forward gang, and a controlmemberconnectedtothetractoratapointlaterally 7g ment comprising forwardand rearward groundworking tools flexibly connected with one another.draft means flexibly connected to the tractor and embodying draftmembers one of which ls connected adjacent one end of theforwardgangandtheotherofwhicliisconnected adjacent the other end of therearward gang and passes over the forward gang adjacent the other end.an angling control member connected to the tractor at a point offsetlaterally from the point of draft connection thereto and tc the forwardgang at a point adjacent the portion over which passes the draft memberconnected yto the rear gang. and stop means acting between the rear gangdraft member and the forward gang and controlled by the control member.

8. A tractor-operated ground-working implement comprising forward andrearward gangs of ground-working tools. means interconnecting the gangsfor relative angling movement in a horiaontal plane, draft meansflexibly connected to the tractor and to both sanas. being connected tothe forward gang at one side of the gang interconnection and to therearward, gang at the other side of the interconnection, means forholding the gangs against relative angling movement, said meansincluding a release means mounted on the front gang, and meansconnecting the release means and the tractor at a point offset laterallyfrom the point of draft connection thereto for causing a turn of thetractor away from the side to which the said point is laterally offsetfrom the draft connection to cause the release means to release theholding means to permit relative angling movement between the gangs.

means for holding the gangs against relative horimntalangular movementand includingrelease means mounted cm the front gang, and meansconnecting the draft means and the release means and responsive toturning of the draft means for actuating the release means.

10. A tractoroperated ground-working implement comprising forward andrearward gangs of ground-working tools, means interconnecting lthe gangsfor relative angling movement in a. horizontal plane, draft meansflexibly connected to the tractor and to both gangs, being connected tothe forward gang at one side of the gang interconnection and to therearward gang at the other side of the interconnection, and meansconnecting the tractor and the forward gang at a point offset laterallyto the last mentioned side of the gang interconnection and responsive toturning .of the tractor for exerting a pull upon the front gang tcpermit the gangs to follow the tractor in making a turn. v

11. A tractor-operated ground-working implement comprising forward andrearward gangs of ground-working tools, means interconnecting the gangsfor relative angling movement in a horizontal plane, draft meansflexibly connected to the tractor and to both gangs, being connected tothe forward gang at one side of the gang interconnection and to therearward gang at the other side of the interconnection. and meansconnecting the tractor and the forward gang and responsive to turning ofthe tractor for exerting a pull upon the front gang to permit the gangsto followthetractorinmakingaturn.

l2. A tractor-operated ground-working imple. ment comprising forward andrearward 'gangs of ground-working tools. means interconnecting the sansafor relative angling movement in a horizontal plane. draft meansflexibly connected to the tractor and to both gangs, being connected tothe forward gang at one side of the gang interconnection and to therearward gang at the other side of the interconnection. means forholding the gangs against relative angling movement including a releasemeans mounted on the front gang, and an angling control member connectedto the tractor and to the forward gang and the release means andoperative upon turning of the tractor to actuate the release means topermit the gangs relative angling movement and to exert a pull on thefront gang to permit the gangs to follow the tractor in making a turn.

13. A tractor-operated ground-working implement comprising forward andrearward gangs of ground-working tools, means interconnecting the gangsfor relative angling movement in a horizontal plane, draft means exiblyconnected to the tractor and embodying draft members severally exiblyconnected to the forward gang at one side of the gang interconnectionand to the rear gang at the other side of` the interconnection, therear-gang-connected member being movable relative to the forward gang,an angling control member connected to the tractor and to the forwardgang at a point offset laterally to the last mentioned side of the ganginterconnection, and stop means acting between the rear gang draftmember and the forward gang and controlled by the control member, theangling control member being operative upon turning of the tractor torelease the stop means and to exert a pull upon the front gang so as topermit the gangs to follow the tractor in making a turn.

14. A tractor-operated ground-working implement comprising forward andrearward gangs of ground-working tools, means interconnecting the gangsfor relative angling movement in a horizontal plane, draft membersflexibly connected to the tractor and to the forward gang at one side ofthe gang interconnection and to the rearward gang at the other side ofthe interconnection. the draft member connected to the rearward gangbeing movable relative to the forward gang, a control member connectedto the tractor and to the forward gang at the last mentioned side of thegang interconnection, the draft member connected to the rearward gangincluding a draft bar, a lock block slidable on the bar, manuallycontrolled means for locking the block to the bar, and means for lockingthe block to the forward gang and controlled by the control member uponturning of the tractor.

l5. A tractor-operated ground-working implement comprising forward andrearward gangs of ground-working tools, means interconnecting the gangsfor relative angling movement in a horizontal plane, draft meansflexibly connected to the tractor and to both gangs, being connected tothe forward gangY at one side of the gang interconnection and to therearward gang at the other side of the interconnection, an anglingcontrol member connected to the tractor at a point oifset laterally fromthe point of draft connection thereto and directly to the forward gangat a point offset laterally to the last mentioned side of the ganginterconnection, means for holding the gangs against relative anglingmovement and including a release means, and means connecting the anglingcontrol member and the release means.

16. The device specied in claim 15, the release means being mounted onthe forward gang.

17. In a tractor-drawn offset harrow, two gangs connected for relativehorizontal angular movement, means for holding the gangs againstrelative angular movement including a release means mounted on the frontgang, draft means connecting the tractor and a point on one gang on oneside of theconnection of the gangs and a point on the other gang on theother side of the connection oi' the gangs. and means for actuating therelease means bya movement of the tractor to allow the gangs relativeangular movement.

18. In combination, a forward tool, a rearward tool, means forming aconnection between the tools to permit relative movement, means holdingthe tools against relative movement and including a release meansmounted on the front tool, draft means, means connecting the draft meansand a point on-the forward tool on one side of the connection betweenthe tools and a point on the rearward tool on the other side of theconnection between the tools, and means responsive to a turning of thedraft means for actuating the release means to permit the tools relativeangular movement.

19. In combination, a. forward tool, a rearward tool, means forming aconnection between the tools, draft means, hitch means connecting thedraft means and a point on one tool on one side of the connectionbetween the tools and a point on the other tool on the other side of theconnection between the tools, means for holding the tools againstmovement with respect to the hitch means including a release meansmounted on the front gang, a control device on the draft means, andmeans responsive to a movement of the control device beyond a certainpoint for actuating the release means.

20. A tractor-operated ground-working implement comprising forward andrearward gangs of ground-working tools, means interconnecting the gangsfor relative angling movement in a horizontal plane, draft meansflexibly connected to the tractor and to both gangs, being connected tothe forward gang at one side of the gang interconnection and to therearward gang at the other side of the interconnection, means forholding the gangs against relative angling movement including a releasemeans mounted on the front gang, and an angling control member connectedto the tractor and to the release means and the forward gang adjacentthe release means and operative upon turning of the tractor to actuatethe release means to permit the gangs relative angling movement and toexert a pull on the front gang to permit the gangs to follow the tractorin making a turn.

21. A tractor-operated ground-working implement comprising forward andrearward gangs of ground-working tools, means interconnecting the gangsfor relative angling movement in a horizontal plane, draft meansflexibly connected to the tractor and to both gangs. being connected tothe forward gang at one side of the gang interconnection and to therearward gang at the other side of the interconnection, an anglingcontrol member connected to the tractor at a point offset laterally fromthe point of draft connection thereto and to the forward gang at a pointoffset laterally to the last mentioned side of the gang interconnection,means for holding the gangs against relative angling movement andincluding a release means mounted on the front gang. and meansconnecting the angling control 'member and the release means.

22. A tractor-operated ground-working implement comprising forward andrearward gangs of ground-working tools, means interconnecting the gangsfor relative angling movement in a horizontal plane, draft means exiblyconnected to the tractor and to both gangs. being connected to theforward gang at one side of the gang interconnection and to the rearwardgang at the other side of the interconnection, an angling control memberconnected to the tractor at a point oifset laterally from the point ofdraft connection thereto and to the forward gang at a point offsetlaterally to the last mentioned side of the gang interconnection, meansfor holding the gangs against relative angling movement and including arelease means mounted on the front gang adjacent the point of connectionof angling control member to the front gang. and means connecting theangling control member and the release means.

23. In combination a disk harrow comprising two gangs connected forrelative horizontal angular movement, draft means for drawing theharrow, means connecting the draft means and a point on one gang on oneside of the connection of the gangs and a point on the other gang on theother side of the connection of the gangs, means for holding the gangsagainst relative horizontal angular movement and including release meansmounted on the front gang. and means connecting the draft means and therelease means and a point on the front gang adjacent the release meansand responsive to turningofthedraftmeans foractuatingtherelease meansand for shifting the gangs for turning.k

24. A tractor-operated ground-working implement comprising forward andrearward gangs of ground-working tools, means interconnecting the gangsfor relative angling movement in a horizontal plane, draft meansflexibly connected to the tractor and to both gangs, being connected tothe forward gang at one side of the gang interconnection and to therearward gang at the other side of the interconnection, means forholding the gangs against relative angling movement. said meansincluding a release means mounted on the front gang, and meansconnecting the release means and the tractor at a point oifset laterallyfrom the point of draft connection and extending in a relatively directline between the release means and the said offset point on the tractorthereto for causing a turn of the tractor away from the side to whichthe said point is laterally oflsetffrom the draft connection to causethe release means to release the holding means to permit relativeangling movement between Ithe gangs.

25. In combination, a disk harrow comprising two gangs connected forrelative horizontal angular movement, draft means for drawing theharrow, means connecting the draft means and the front gang on one sideof the connection of the gangs and the rear gang on the other side ofthe connection of the gangs,means for holding the gangs against relativehorizontal angular movement and including release means mounted on thefront gang to the same side of the connection of the gangs as theconnection between the draft means and the rear gang. and meansconnecting the draft means and the release means and a point on thefront gang adjacent the release means and responsive to turning of thedraft means for actuating the release means and for shifting the gangsfor turning.

26. In combination, a disk harrow comprising two gangs connected forrelative horizontal angular movement. draft means for drawing theharrow, means connecting the draft means and a point on one gang on oneside of the connection of the gangs and a point on the other gang on theother side of the connection of the gangs. means for holding the gangsagainst relative horizontal angular movement and including release meansacting directly on the front gang, and means connecting the draft meansandthe release means and responsive to turning of the draft means foractuating the release means.

27. A tractor-operated ground-working implement comprising forward andrearward gangs of ground-working tools, means interconnecting the gangsfor relative angling movement in a horizontal plane, draft meansflexibly connected to the tractor and to both gangs. means for holdingthe gangs against relative angling movement including a release meanscomposed of disengageable parts acting directly on [the forward gang.and an angling control member connected to the tractor and to one of thedisengageable parts of the release means and the forward gang adjacentthe release means and operative upon turning of the tractor to actuatethe release means to permit the gangs relative angling movement and toexert a pull on the front gang to permit the gangs to follow the tractorin making a turn, said angling control member and release means beingpositioned on the same side of the point about which angular turningmovement takes placebetween the gangs.

28. In combination. a disk harrow comprising two gangs connected forrelative horizontal angular movementl draft means for drawing theharrow. means connecting the draft means and both gangs, means forholding the gangs against relative horizontal angular movement andincluding release means composed of disengageable parts acting directlyon the front gang. and means extending along a line between the draftmeans and directly connected lto one of the disengageable parts of therelease means and responsive to turning of the draft means for actuatingthe release means and for shifting the gangs for turning.

JACOB V. DYRR.

